Will give brainliest !

which of the following examples demonstrates velocity?

a) a 10.0 kg object
b) a truck that traveled 12.5 m
c) a 3.5 kg object moving at 1.5 m/s
d) a car moving northeast at 90 km/hr

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600